/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Returns the currently set PlaySessionRequest (if any). Unset if there is no session queued or has already been started (seeGetPlayInEditorSessionInfo())
const [TOptional](API\Runtime\Core\IO\TOptional)< [FRequestPlaySessionParams](API\Editor\UnrealEd\FRequestPlaySessionParams) > GetPlaySessionRequest() const